Process and apparatus for making paper



' 1,616,903 1927' KIRSCHBRAUN PROCESS AND APPARATUS FoR MAKING PAPER Filed March 28, 1 924 2 spaced apart to accommodate the application Patented Feb. 8, 1927.

UNITED STATES LESTER KIRSCHIBRAUN, OF CHICAGO, ILLINOIS.

PROCESS AND APPARATUS FOR MAKING PAPER.

. Application filed March 28, 1924. Serial No. 702,482.

This invention relates to improvements in process of making paper, and refers more particularly to a process for making multiply sheets, in which, between certain plies there is interposed a liquid repellent medi- 11m- By means of the-present invention, the liquid repellent medium is preferably interposed betweengiven plies as the paper is being formed, and also by means of the pres ent invention two or more separate sheets may be produced after the paper has been dried, each of which sheets carries liquid repellent material on its surface.

The objects and advantages of the invention will more clearly appear from the following description, in which' Fig. 1 is a somewhat diagrammatic view, partly in side elevation and partly in vertical section; of the cylinder molds of a multicylinder paper machine, on which the process maybe carried out.

Fig. 2 is a somewhat diagrammatic view of the dry end of the machine, showing the balance of the hot driers and winding up reels.

Fig. 3 is a view, on an enlarged scale, of the application roll and box, forming a feature of the invention. A

Referring to the drawings, '1 designates the vats in which are mounted the cylinder molds 2. Above the cylinder molds are the usual couch rolls 3, blanket'4 and drum roll 5.. Mounted above the blanket 4-are the adjustable depression rolls 6. of which there are two in the present instance. It will be noted that, in this apparatus. the vats are boxes. The object of having two applica tion boxes is to be able to use one in the event the other is out of order, or needs cleaning, and thus avoid the necessity of stopping the operation, or to provide for a plurality of applications.

The construction of the application boxes and rolls is shown more clearly in Fig. 3.

in which,7 designates the application box and 8 the roll. The roll 8 may be covered withtwo or three inside layers of say, 14

meshwire and one outsid layer of 50 mesh wire, and the roll may be driven. Thebox 7. may lee-provided with an overflow dam 9 and outletpipe 10, rovided with a suitable valve 11. To the pipe lO is suitably connected a swinging pipe 12 which can be raised or lowered in the funnel 13, which pump 16 through line 17 to the head box 18. V

This head box 18 in turn connects through pipe 19 having control valve .20 to the application box 7 By means of this arrangement the emulsion may be continuously applied to the underface of the sheet as it leaves the right hand set of cylinder molds. As the coated sheet liquid repellent layer such as asphalt and the like will be interposed between the upper and lower plies of the sheet.

The sheet. after passing over the various pressure rolls and driers. finally passes out over the last of thehot driers designated 21 and is then manually separated and one sheet guided over the tale roll 22 rotating in the tale box 23 while the other sheet is drawn over the roll 24, supplied with talc from the-talc box 25. Separating rolls 26 .and 27 are preferably provided with high pressure steam. say.'at about 150 pounds pressure. The calendar rolls, as shown more clearly in Fig. 2 may be bypassed and the sheets. carried directly to the winding up reels 29, 30, 31 and 32. These reels are in pairs so that the reel a,- for example, is winding up the new sheet while the reel 6 is unwinding the previously wound sheet, rewinding it :on another spool. The manner in which this is accomplished. is obvious and need not be described in more detail.

' In carrying out the process, I first make an emulsion, preferably of a non-adhesive character, of asphalt or other bituminous asses to the left hand i .set of cylinder mol s, it is obvious that a material, with clay or other argillaceous 1 scribed in my issued patents and this speci-' fication need not be encumbered with a detailed description thereof, This previously prepared emulsion may be fed fromthe storage tank 15, in the manner heretofore described, into the application box 7. The screen covered application roll picks up the emulsion and applies it to the underface of the oncoming sheet. The layer of emulsion is, of course, squeezed between the upper and lower, plies from the left and right hand cylinder molds respectively and then as the sheet passes over the driers, the water is re-.

moved and a sheet-with an asphalt or v at substantially the same productionrate at is formed. As the sheet passes over the last-- molds, or" if desired, between the first andlar bituminous layer between the outer plies driers, it is manually separated and the two or more separated sheets pass over the talc rolls 22 and 24;. By this method two independent sheets are formed, eachof which has on one of its surfaces a coating of .a liquid repellent or waterproof material such as asphalt or bitumen. It is to be understood that either one or both of. the application rolls may be used at one time,.and further, .that as many cylinder molds and application boxes may be-used'as is desired. Further-. more, the asphalt or other "bituminous layer might, if desired, be interposed between say,

the two upper plies and the four lower lies. This obvlously could be accomplishe by shifting the position of the application boxes relative to the cylinder molds, as for exam-' ple, placing the cylinder boxes between the second and third of the right hand cylinder 1 second of the left handcylinder molds. The.

particular apparatus forms the subject of a separate application.

t is to be understood that theseparatingoperation may be carried on as described, or may be conducted as .a subsequent operation on a se arate piece of equipment not direct'-,

ly or continuously co-ordinated with'the paper making machine per se. In such in stances the paper making operation would be conducted in accordance with the disclosure ofco-pending application, Serial No. 702,314 filed March 27th,-1924, and the paper wound up in large rolls, after which it is subjected to the separating or splitting operation.

I have shown and described a processof forming two sheets of paper having waterroofing medium OIl OI18 surface of each.

' t will be clear that by applying between successive plies, layers of waterproofing material in the manner described, more than two waterproof sheets can be-simultaneously pro- Eluced during the same paper-making opera-' ion.

The advantages of an operation of. this kind, whereby a lurality of sheets of;light paper are formed and waterproofedsimultaneously, is obvious. .It is' well known that in order to have maximum production upon an ordmary'board mach ne such. as described the limiting factor-s of speed militateiagainst the production ,of maximum tonnage of'light' weight paper or board. It'will be readily seen that where the average board machine operates to produce a satisfactory tonnage 1n the production of paper from 18 to '35 C0 caliper, the productionof an 8 point sheet on such a machine becomes a slow and 'expensive operation, but by employing the process of the present invention, it is perfectly feasible to'simultaneously produce 'twosheets of say, 8 points and 12 points each in caliper which the machine operates for a 20 -point sheet,-orit is possible to produce say, two

8 point sheets at practically the sameproproof ply in direct contact with the blankets and presses. of the paper-making machine e n u. l where 1t 1s desired to make paper hav ng a waterprooii-ng material on the surfaces.

' I claim as my 1nvent1on:

' 1. A -method of making .waterproofed paper, eomprisingaforming on a paper machine, a plurality of fibrousplies, interposing during the paper forming operation a .layeror layers of liquid repellent material between predetermined innerplies by causing the wet plies to pass in'contact with a rotating surface carryin said liquid repellent material, uniting t e plies to form a sheet, separating the sheet at the point of the interposed liquid repellent layer and drawing oft such separated sheets.

2. A method of making avaterproofed paper comprising forming on a paper machine, webs oncertain cylinder molds, forming other webs on other cylinder molds, interposing layers of emulsified waterproofing material between the opposed wet surfaces of certain webs by bringmg certain webs into contact with a rotating element carrying said 'liquid repellent material, in then uniting the Webs and layers into a single sheet and'pas'sing it over the usual driers, in then separating the sheet at said interposed waterproofing layers, and independently removing said separated waterproofed sheets.

. 3. A process of simultaneously producing a plurality of sheetshaving waterproofing material on the surface thereof, comprising forming a plu'ralityof fibrous plies on a paper machine, causing given intermediate plies to be brought into contact with the surface of a rotating element carrying Waterproofing material whereby a layer of waterproofing material is applied 'to said fi brous surface, forcing. the plies together on either side of said layer, passing the same over-driers and then separatin the same into independent sheets at the'pomt'where said waterproof layer is interposed.

4. In an apparatus for .making paper, thecombinationwith cylinder molds for forming a multiply sheet, means for applying liquid repellent layer between intermediate plies and means for separatin the sheet along the line of said layer, and means for independently removing the separated sheets. 5. In an apparatus for making paper, the combination with cylinder molds for forming a multiply sheet, 'means for applying liquid repellent layers between intermediate plies and means for separating thesheet alongi; the line of said layers and means for independently removin the separated sheets. 6. A process of sun taneously producing a plurality of sheets each having waterproofing material on a surface thereof, comprising forming a plurality of fibrous plies on a paper machine, causing given intermediate plies while still wet to have applied thereto a pre-formed film of waterproofing 7. Aprocess of simultaneously producing r a plurality of sheets each having waterproof ing material on a surface thereof comprising formin' a plurality of fibrous plies on a paper mac ine, causing given intermediate 20 plies while still wet to have ap lied thereto a pro-formed film of waterproo ng material, forcingthe plies together on-either side of said film to produce a multi-ply shee't,passing the said multi-ply sheets over driers, 25

separating said multi-ply sheets into independent sheets at the point where said waterproofing layer is interposed, while at a temperature sufficiently elevated to permit sepa- I ration.

LESTER KIRSCHBRAUN. 

